$(function(){

  var ua = navigator.userAgent.toLowerCase(),system=""; 
  if(/iphone|ipad|ipod/.test(ua)){
    system = "ios";
  }else if (/android/.test(ua)){
    system = "android";
  }
  if($("section[appShow="+system+"]").length > 0){
    $("section[appShow="+system+"]").css({"display":"block"});
  }

})